Among the most star-studded of this year's holiday specials, iHeartRadio's annual concert, recorded earlier this month, features a lineup including Taylor Swift, performing some of her new songs off Reputation, Ed Sheeran, The Chainsmokers, Fifth Harmony, Liam Payne, Camila Cabello and Niall Horan.

Jen (Zoe Lister-Jones) and Greg (Colin Hanks) hire Clementine (Hunter King) as a part-time nanny for Lark, but Clementine thinks Jen is Lark's grandmother. Tyler (Niall Cunningham) has his own unfortunate miscommunication when he discovers his new girlfriend is Sophia's (Giselle Eisenberg) fourth-grade teacher. John (James Brolin), meanwhile, hires a rather questionable company to build an escape room in his house.

Van Helsing
Syfy, 9 ET/PT

The supernatural drama solves a big mystery when an organization fighting to find a cure for vampirism enlists the help of one of our heroes. The development puts established loyalties to the test, with potentially deadly results.